Quote Originally Posted by eddieobscurant View Post
I've got my reference sapphire at 820Mhz with 1.44vcore 24/7 for several months without a problem. I have tried up to 1.6 vcore for benches without a problem. I couldn't get it 100% stable at 840Mhz no matter what voltage i used, even at 1.6 it wasn't 100% stable. The only problem that i have found is that at high voltage during furmark, when i'm not stable (for example when i was trying for 840) and i got artifacts, these artifacts wouldn't leave until i shut down my computer. After that everything was normal. With just a reboot the issue wasn't resolving and i don't know why.
mine was not reference sapphire but the core just destroyed at 1.5V artifacts even at stock the mems was stock then unmodded duno yesterday i got it buck from rma this time they gave me reference but with 1Gb mem i was using ati tool for testing do you think furmark is better ?